Ρ-hydroxybenzaldehyde in the surface wax of sorghum: its importance in seedling resistance to acridids
1982
WOODHEAD, SUSAN
The deterrent effects of a lipid extract from seedling Sorghum bicolor on Locusta migratoria migratoroides (R. & F.) reside in several of the surface wax components of the extracts. ρ-Hydroxybenzaldehyde has been identified as an antifeedant present in the surface wax of all cultivars examined. Its concentration in the wax varies considerably with cultivar and in some (e.g. 6SD and CSH 1) it is present at concentrations which are highly deterrent to Locusta. In all cultivars its concentration decreases with increasing plant age and palatability, and it is only present in deterrent amounts in the early stages of growth. Sorghum seedlings appear to possess particularly thick or resistant cuticular waxes as compared to other Gramineae, and the chemical composition of the waxes of all the cultivars examined appeared to be qualitatively similar.
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